Modeling Of Flexible Multibody System Dynamics, Price Cuts And Fine Computing Research

In this paper, aimed at the idiographic characteristics of flexible multibodysystem, we studied its three aspects: modeling, decreasing scale, andprecise time integration algorithm.The main characteristic of flexible multibody dynamic system is: theflexible components of system undergo not only great rigid movement butalso small distortion movement, and they are highly coupling.On the aspect of modeling, we educe the dynamic equation ofunrestricted flexible body by Lagrange theory, via restriction equations, thenassemble them into flexible multibody system. We also discussed anothermethod named step educing to model the flexible system, and compared theiradvantages and disadvantages.Though used model-decreasing method, the scale of flexible multibodysystem still will be a large number. On the adjoint simplectic inversesubstitution method (ASSISM) based on the analogy theory betweenstructural mechanics and optimal control, the ASSISM preserves the originalsystem matrices but rotates the adjoint simplectic subspaces in the all-dimension space with iterations such that the eigensolution under Hamiltonsystem converges exactly. This paper successfully used this method to solvethe variant structural dynamic questions and broaden its using area.The precise time integration algorithm is a high precise and stable styleto solve ordinary differential equations, it can solve the stiff propertycalculational fatalness and also can solve the nonlinear dynamics questions.Because of it's big advantage, we use this algorithm to solve a rigid-flexiblequestion, and prove that this method can also suitable to this kind of question,find a new way to resolve questions of flexible multibody system.